Targeted Linux test for #459: preserve HD lettering when speculative font warmup encounters unsupported characters or an optional CJK face is absent. Both gameplay and custom-menu warmup are covered; genuinely required missing glyphs still fall back to the original text.
Download the complete Linux archive, extract it into a separate folder, add your own ROM and keep --safe-startup on the native Steam command that already works. Enable HD text and check dialogue/deck lettering. Fonts are included; a new HD-media import is unnecessary. Keep original saves and installation.
Normal/default SteamOS startup is still under investigation. This test is for the lettering on the compatible route; physical Gaming Mode confirmation remains pending. It does not bundle FFmpeg/FFprobe or change resolution/quality. Japanese retains original lettering without a usable CJK face; EXP notices intentionally remain pixel art.
Fresh EU/US/JP native32 cores: c87838bcb13e5eaca1f267fdce0a3abee156d457, integrated by #489 as 50ed2618bf84c0e723c80ed911f2fdba561713de. The previous desktop test's64-bit core/libraries and compatible-startup/Quit fixes are retained with component provenance in SOURCE.json. This is a separate prerelease; stable2.2.5 and earlier test archives remain unchanged.
The exact final archive passed four isolated Linux game routes, including HD lettering/counters, original Japanese fallback, saved safe-mode preferences and orderly Quit81. Earlier before/after controls verify that HD-off pixels remain identical. Software/dummy-audio VM checks do not certify physical GPU, audible continuity or SteamOS startup. See TEST-RESULTS.json for scope and SHA256SUMS for file identity.